Instrument calibrating demand flow regulator



FIG. 1 is a front elevational view of the instrument calibrating demand flow regulator illustrating my design;

FIG. 2 is a top plan view of the instrument calibrating demand flow regulator;

FIG. 3 is a bottom plan view of the instrument calibrating demand flow regulator;

FIG. 4 is a left elevational side view of the instrument calibrating demand flow regulator;

FIG. 5 is a right elevational side view of the instrument calibrating demand flow regulator; and,

FIG. 6 is a rear elevational side view of the instrument calibrating demand flow regulator. 

The ornamental design for an instrument calibrating demand flow regulator, as shown and described. 